like a scene kid, only not a kid anymore. a person over the age of 21 who is still trying to stick with their former "scene kid" self or starting the trend later than the average age. usually looked upon by children, tweens, and teenagers as one of those old people who tries to be "hip" and "with it"

scene kid: omg look at that old chick trying to be us!
scene kid 2: what is she, like 25?
scene kid: yeah, she's a total scenior!